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Short-term and long-term debt - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |
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Dec. 31, 2012 | Jun. 22, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Domestic Rate Loans | Dec. 31, 2012 Domestic Rate Loans Federal Funds Base Rate | Dec. 31, 2012 Domestic Rate Loans Libor Rate | Dec. 31, 2012 Eurodollar Rates | Dec. 31, 2012 Term Loan | Jun. 22, 2012 Term Loan | Dec. 31, 2012 Revolving Credit Facility | Jun. 22, 2012 Revolving Credit Facility | Dec. 31, 2012 Mortgage Note | Jun. 01, 2012 Mortgage Note | Dec. 31, 2012 Vehicle And Equipment Loans Minimum | Dec. 31, 2012 Vehicle And Equipment Loans Maximum
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under PNC Facility |  | $ 27,000,000 |  |  |  |  |  | $ 40,000,000 | $ 4,000,000 | $ 36,000,000 | $ 23,000,000 |  | $ 855,000 |  |
Proceeds from borrowings under PNC facility | 9,548,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees and expenses relating to PNC facility | 245,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding under PNC facility | 16,451,000 |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |
Available borrowing under PNC Facility | 10,357,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PNC Facility effective Rate of interest | 4.00% |  |  |  |  |  |  |  |  |  |  |  | 4.00% | 2.90% | 8.70%
Interest rate Description under PNC Facility | Interest charges with respect to loans are computed on the actual principal amount of loans outstanding during the month at a rate per annum equal to (A) with respect to domestic rate loans, the sum of (i) a rate per annum equal to the higher of (1) the base commercial lending rate of PNC, (2) the federal funds open rate plus .5% and (3) the daily LIBOR plus 1%, plus (ii) .5% and (B) with respect to Eurodollar rate loans, the sum of the Eurodollar rate plus 2.25%. |  |  |  |  |  |  |  |  |  |  |  |  |  |
PNC facility Spread Rate for calculation of Interest |  |  |  | 0.50% | 0.50% | 1.00% | 2.25% |  |  |  |  |  |  |  |
PNC credit Facility expiration date |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2017 |  |  |
Capital leased assets gross | 128,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance of this mortgage note | $ 764,000 |  | $ 903,000 |  |  |  |  |  |  |  |  |  |  |  |

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